PureSolo lets you sing and record songs online. You can perform any of your favorite songs and tracks, and then share them on the site and online. To record your first track, sign up for an account and install the PureSolo browser plugin. Then choose the track and download its accompaniment sheet music, guitar tab or a karaoke backing track from the site store (credits needed for downloading).
via PureSolo: Sing & Record Songs Online.
